Compound slips



April 8, 1930.

R. A. WILSON ET-AL ,7

COMPOUND SLIP Filed Dec. 1926 3 Sheets-Sheet 1 April 8, 1930. R. A.WILSON ET AL 1,753,543

COMPOUND SLIP Filed Dec. 1926 3 Sheets-Sheet 2 April 8, 1930.

R. A. WILSONYET AL COMPOUND SLIP 'Filed Dec. 6, 1926 5 Sheets-Sheet 3Guiana;

Patented Apr. .8, 1930 -uNiT-Eo sures PATENT OFFICE ROBERT Wilson nncnAl-mns s. antennas, on DALLAS, TEXAS, ASSIGNORS TO THE GUIBER-SONCORPORATION, or DALLAS, Ta es, A CQRPOR-ATiON or DELAWARE COMPOUND SLIPSApplication filed December 6,1926. Serial no. 152,77

This invention relates to new and useful improvements in compound slipscomprising a plurality of toothed core members.

The object of the invention is to provide slips comprising an outer slipmember or jacket and an inner slip member or core, the jacket having itsouter surface or walls inclined to a less degree than its inner walls,whereby when the slips are lifted the outer surfaces of the jacket willdisengage from i the socket prior'to the disengagement of the core fromthe inner walls ofthe jacket, and

also whereby the jacket, willdisengage from the core and fall back intoits socket after the initial movement, thus freeing the core and makingfor easier removal as well as the elimination of the usual practice ofhammering and jarring to loosen the slips.

A furtherobject of the invention is to provide the core sections withmeans for supporting them from a single support and to make themself-closing in connection with said support, whereby they aremorereadily applied, removed and inserted in the jacket.

Anotherobject of'the invention is to provide the slip jacket withinternalcurviline ar faces formed on different radiiof curvature fromthe outer face of the jacketand conforming to the arcs of the slips,whereby the entire outer surface of each-slip has a full bearing on theface of the'jacket and the strain is evenly distributed.

, A construction designedto carry out the invention will be hereinafterdescribed, together with other features of the invention.

The invention will be more readily understood from a reading of thefollow ng specificationand by reference to the accompanying drawings, inwhich an example of the invention is shown and wherein:

' Fig.1 is a view partially in section and partially in elevationshowing slips constructed in accordance with ourinvention,

Fig. 2 is a plan view of the same, I Fey. 3 is a view similar to Fig.lshowing the s ps l f e a th j k t dis ngage Fig.4. is a plan of thecore, with its slips open, I

F g 5 a o t-em View o th s me. -61 e ele v e sh n emodifi form of jacketwith the, slip sectors mounted therein, and p Fig. 7 is an elevation,ofone of the jacket members shown in Fig. 6,. j i

i In the drawings the numeral 10 designates one section and 11, theother section of a jacket, said sections being substantiallysemicircular and each having an outwardly directed flange 12. Inth'e'top of each jacket section is ascrew threaded recess 13 in whicheyebolts may be inserted forremoving the jacket from the rotary table orother support Each section has an inclined outer wall or surface 15 andan inclined inner wallor surface 16, both surfaces beingcurvedcircumferentially. The outer walls areinclincd at substantially the samepitch or degree as the .wallof the socket 17 in which thejacket sectionsare supported. The lower edges of the acket are provided with innerbevels 18. Within the jacket is inserted a core or inner slip member 19comprising three arcuate sectors having their inner walls formed withgripping teeth 20 and their outer walls 21 inclined at substantially thesame degree as the walls 16 of the acket'so as to frictionally engagethe latter. The sectors 19; are connected to a common support by whichthey may be lifted, as will be hereinafter described.

It will be noted that the outer walls 15 of the I sections 10 and 11 areinclined to a less degree lifte a ho t s a e, an nch; mo e less,

thejacket, due to its weig'ht will drop back into its socket as is shownin Fig. 3," the jacket slides down the core,'the sectors t ereo w l befreed .a dWi th isreaoli y release trim; the ork and may jbeleasily re,-

moved.

Over the sectors 19 yokes 22 are mounted. These yokes are curved toconform to the general contour of the core and are rigidly fastened onthe outer sectors by bolts 23. Each yoke has a reduced tongue 24 on itsinner end and these tongues overlap above the intermediate sector. Capbolts 25 se cured to the intermediatesector pass through the yokes andeach yoke is pivoted on one of these bolts. The bolts 25 have heads orcaps provided with eyes 26 for receiving the trunnions 27 of a bail orhandle 28. On the bottom of the slip sectors 19 similar yokes 29 arefastened to the sectors by bolts 30 and are pivoted upon bolts 31. i

It will be seen that the three core sectors 19 may be lifted by the bail28 and easily handled. hen the'slips are held by the handle and theouter sectors allowed to swing apart, the yokes 22 will be swung asisshown in Fig. 4. On the inner end of each yoke is a boss 32. When theyokes are swung the overlapping tongues 24 are displaced so that thebosses lie on each side of the center of the slips. This is also true ofthe bottom yokes 29. lVith the slips open the bosses project, as isshown in Fig. 4, and When the slips are swung toward the pipe thesebosses strike said pipe and cause the sectors to be swung to a closedposition about the pipe.

111 Figures 6 and 7 I have shown a modified form which is similar to thegeneral construction shown in Figure 2, excepting the jacket which isformed of sections 10 and 11 is provided With a plurality of innercurvilinear surfaces or faces 16', each taken on a different center fromthe outer face 16" of the jacket which is concentric to the axial centerof the slip. These faces 16 form individual seats providing increasedsurface contact for the connected core sectors 19 before described. Eachsurface or face is curvilinear transversely on the same radiusthroughout its length and the contacting face 19' of each core sector 19is correspondingly curved, and thus the entire outer face or surface ofsaid sector will contact with each of the internal curvilinear faces 16.The advantage of this structure will be appreciated when the enormousstrain and shock to which the parts must be subjected, is considered.Each sector contacting throughout its entire area, or the major portionthereof, with a curvilinear face, will be substantially sustained,whereby the shock will be absorbed and the strain will beevenlydistributed. The interior surface 16 of each section of the jacketis formed with faces on different radii of curvature from its outersurface to provide gripping engagement with corresponding outer-facesupon the core sectors. V 7

Various changes in the sizeand shape of the different parts, as Well asmodifications and alterations, may be made Within the scope of theappended claims,

hat we claim, is:

1. Compound slips comprising, a jacket having inner inclined walls, acore including a plurality of slip sectors having inclined outer wallsfitting in the jacket, pivoted yokes connecting two of the sectors withan intermediate sector, the inner ends of the yokes overlapping andextended beyond their pivots to form bosses at the inner face of theintermediate sector 'vvhen the sectors are opened.

2. Compound slips comprising, a jacket having inclined inner and outerwalls and composed of sectors,a core fitting within the jacket andcomprising a plurality of sectors, yokes rigidly attached to theoutermost core sectors and pivoted to the'intermediate core sector, anda handle attached to the sectors.

3. Compound slips comprising, a jacket having inclined inner and outerWalls and composed of sectors, a corefitting within the jacket andcomprising a plurality of sectors, yokes rigidly attached to theoutermost core sectors and pivoted to the intermediate core sector, anda handle attached to sector pivots upon the intermediate sector, theinner ends of said yokes overlapping between their pivot points andbeing projected outwardly into the path of the work when the sectors ofthe core are spread apart.

4:. Compound slips comprising, a jacket having inclined inner and outerwalls and composed of sectors, a core fitting within the jacket andcomprising-a plurality of sectors having teeth on their inner faces,yokes rigidly secured to the top and bottom of the outermost coresectors and pivoted to the intermediate core sector, and a handlepivotally connected to the top of the intermediate core sector. V

5. Compound slips comprising, a jacket having inclined inner and outerwalls and composed of sectors, a core fitting within the jacket andcomprising a plurality of sectors I,

from the inner toothed faces of the sectors.

7. Compound slips comprising :an outer jackethaving a plurality ofinterior" curvilinear faces formed on different radii of curvature fromthe outer face of the jacket, and a core comprising a plurality ofinteriorly toothed sectors having their outer'faces separately curved onsimilar radii toflseat upon the interior f es f the jacket.

